<template>
  <div>
    <!-- 顶部滑动条 -->
    <div id="slider" class="mui-slider">
      <div
        id="sliderSegmentedControl"
        class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted"
      >
        <div class="mui-scroll">
          <a
            :class="['mui-control-item', item.id == 0 ? 'mui-active' : ''] "
            v-for="(item, index) in cates"
            :key="index"
            @tap="getPhotoListByCateId(item.id)"
            href="#item1mobile"
            data-wid="tab-top-subpage-1.html"
          >{{ item.title }}</a>
          <!-- <a class="mui-control-item" href="#item2mobile" data-wid="tab-top-subpage-2.html">热点</a>
          <a class="mui-control-item" href="#item3mobile" data-wid="tab-top-subpage-3.html">北京</a>
          <a class="mui-control-item" href="#item4mobile" data-wid="tab-top-subpage-4.html">社会</a>
          <a class="mui-control-item" href="#item5mobile" data-wid="tab-top-subpage-5.html">娱乐</a>
          <a class="mui-control-item" href="#item5mobile" data-wid="tab-top-subpage-5.html">科技</a>
          <a class="mui-control-item" href="#item5mobile" data-wid="tab-top-subpage-5.html">世界</a>-->
        </div>
      </div>
    </div>
    <!-- 图片列表区域 -->
    <ul class="photo-list">
      <router-link v-for="(item, i) in list" :key="i" :to="'/home/photoinfo/' + item.id" tag="li">
        <img v-lazy="item.img_url">
        <div class="info">
          <h1 class="info-title">{{ item.title }}</h1>
          <div class="info-body">{{ item.zhaiyao }}</div>
        </div>
      </router-link>
    </ul>
  </div>
</template>

<script>
// 1. 导入 mui 的js文件
import mui from "../../lib/mui/js/mui.min.js";
import { Toast } from "mint-ui";

export default {
  data() {
    return {
      cates: [], // 所有分类列表
      list: [] // 图片列表数组
    };
  },
  created() {
    this.getAllcategory();
    //  默认进入页面，就主动请求 所有图片列表数据
    this.getPhotoListByCateId(0);
  },
  mounted() {
    // 生命周期函数，当组件中的DOM结构渲染好并放到页面中去，会执行这个钩子函数。如果要操作dom，最好在mounted里面
    // 2. 初始化滑动控件
    mui(".mui-scroll-wrapper").scroll({
      deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
    });
  },
  methods: {
    getAllcategory() {
      //  获取所有的图片分类
      this.$http
        .get("api/getimgcategory") // 后端接口  视频提供api失效，需自己手写。
        .then(result => {
          if (result.body.status === 0) {
            //  手动拼接出列表完整分类
            result.body.message.unshift({ title: "全部", id: 0 });
            this.cates = result.body.message;
          } else {
            // 失败
            Toast("获取新闻详情失败！");
          }
        });
    },
    getPhotoListByCateId(cateId) {
      // 根据分类 Id 获取图片列表
      this.$http.get("api/getimages/" + cateId).then(result => {
        if (result.body.status === 0) {
          this.list = result.body.message;
        } else {
          Toast("failure");
        }
      });
    }
  }
};
</script>

<style lang="scss" scoped>
* {
  touch-action: pan-y;
}
.photo-list {
  list-style: none;
  margin: 0;
  padding: 10px;
  padding-bottom: 0;
  li {
    background-color: #ccc;
    text-align: center;
    margin-bottom: 10px;
    box-shadow: 0 0 9px #999;
    position: relative;

    img {
      width: 100%;
      height: 100%;
      vertical-align: middle;
    }

    img[lazy="loading"] {
      width: 40px;
      height: 300px;
      margin: auto;
    }

    .info {
      color: #fff;
      background-color: rgba(0, 0, 0, 0.5);
      text-align: left;
      position: absolute;
      bottom: 0;
      max-height: 84px;
      .info-title {
        font-size: 14px;
      }
      .info-body {
        font-size: 13px;
      }
    }
  }
}
</style>
